JPS6229905A - Grass reaping apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention Technical Field The present invention ('', mowing Z) transverse to the moving direction of the device-4
They are arranged in a row on one side of the roller extending in the - direction, and each
At least two fixed teeth are installed, each tooth is formed in an arc shape and has one free end. a plate, extending in the direction of said circular arc and cooperating in a cuttable manner with said blade of the associated fixed plate;1. A blade section is installed on each fixing plate to hold at least one knife member, and -
1- A pressurizing means is provided for pressing the gear rear part 10A which can be rotated around the center of the circular arc and the specific or each knife part related fixing plate with a predetermined pressure. 〇I am concerned about the cutting equipment.

Existence ['1 Imakami Da1 Small f-1, Said Ruyi Grass Mowing Device (', British Patent Specification No. GB
- A-2,087,705, published by the Japanese Patent Publication No. 2005-20001, and known from this prior publication, is a cutting device (J1) consisting of a group of knife members consisting of a number of knives.

Each knife member (") is capable of hinge movement around a hinge line located a little distance from the blade. However, the current mowing devices have an unacceptable effect on the mowing operation, especially at the blade section at the hinge line.

The present invention (J, -1-) has been made in view of the problems of conventional mowing devices, and is characterized by undesirable sensitivity to small disturbance factors such as those mentioned above. The object of the present invention is to provide a mowing device which can reduce the reaction rate and operate extremely effectively with relatively small power.

In order to achieve the above object, in the mowing device according to the present invention, each gear rear member supports a group of up to three knife members, and each knife member is substantially It is configured to be supported so as to be able to hinge around a hinge line extending in the plane of the blade portion.

Additionally, the hinge line should be spaced from the free end of the knife member at least twice the length of the blade of the knife member.
Position 1. Advantageously employed in the embodiments 1. Get it.

In particular, the hinge line seen from the knife part IA is
It is preferable to adopt a position cell embodiment on the opposite side of the center of A.1. stomach. This embodiment can be understood as the theoretically best example in which the hinge line is at an infinite position.
The other knife parts (A, and (') in the group are determined by the other two knife parts (3J-).

In order to enable vLj joints for several types of leaf pieces to be cut, the pressure means ('') is configured to be adjustable.

United States Patent Specification Box US-A-2,267,944 and French Patent Specification Box No. PR,-C-1,094,3
No. 56, in these prior art devices, the contact between the cooperating knife member blade and the tooth blade moves inwardly in the run-out zone. , as a result, especially for blades that are not very sharp (j
, leaving the accumulation of leaf fragments raw and eventually (J) crushed at one time, leading to premature wear of the device, while also avoiding the inward penetration of hard objects such as stones. This can cause damage to the equipment.

Therefore, according to the present invention, in order to eliminate the undesirable phenomenon as described in -1-, the blade part and teeth of the cooperating knife member are always directed outward while the carrier member is being rotated. Configure it to move to .

In the above-mentioned known device, if the blades are bent, the two blades will hit hard, causing damage and trouble.

On the other hand, in the latter alternative embodiment mentioned above, the above-mentioned danger does not exist, and furthermore, an excellent self-polishing effect of the blade part is achieved. This self-sharpening effect is obtained by applying pressure in the area of contact between the knife member and the tooth edge.

Also, the path of the adjacent knife part +4 is partially
An embodiment in which the knife members overlap to a substantial degree, the knife members rotate at the same number of revolutions per minute, and exhibit a phase difference such that they do not come into contact with each other even at the overlapped portions ("), which can be advantageously applied. It is.

- In connection with the above-mentioned French patent specification No. 1'
According to RC-1,094,358, the paths of adjacent knives partially overlap, so that the knives rotate at the same number of revolutions per minute,
However, in the mowing device according to the French patent specification, the circular path drawn by the knife is It should be noted that the blade does not extend halfway into the blade.As a result, dirt or other material may accumulate on the sharp tip of the tooth that does not contact the knife, making it difficult to compare. There are cases where the proper operation of the mowing device is hindered to the extent that it becomes unusable for a short period of time.

A preferred embodiment of the invention is characterized in that the tooth edges extend substantially perpendicularly at λ·1 to the main plane of the associated fastening plate. In this case, both sides of the fixing plate can interact with the knife member. In that case, each plate can be used twice, including being removed and reattached in the opposite direction.

As a comparative example, the same effect can be obtained by positioning the fixing plate at the same location (J), but on the opposite side of the center of the row.
- In the above arrangement, such a fixed plate (J1 location may be replaced).

Furthermore, doubling the useful life of each fixing plate by rotating the fixing plate can be achieved by applying an embodiment in which each fixing plate is machined symmetrically with respect to the connecting line between the centers of the circular arcs.

Yet another alternative embodiment is to arrange each gear rear member on the side facing its associated fixed plate with a resilient scraping member for scraping debris and other deposits from said fixed plate. The scraping member is characterized by extending to the blade portion of the tooth of the fixed plate. The scraping member scrapes away dirt or other deposits. If this scraping element is absent, there is a risk that deposits will gradually build up, reducing the desired pressure angle between the fixing plate and the knife element and affecting the good operation of the mowing device. In this regard, any force exerted by the resilient scraping member is neutralized by the force exerted by the pressure means. It will therefore be clear that at least the condition that a net applied force is maintained between the knife members and the plates is satisfied.

In the mowing device according to the invention, the knife members can rotate at a relatively low number of revolutions per minute despite their small number. Dutch Patent Specification No. NL-A-7,80
No. 1,408 discloses a device in which the knife-carrying saw disc holds only three knives. However, with this device there is the problem that the leaves to be cut are knocked off due to the very high speed of the knife element, whereas with the device of the invention such leaves are advantageously cut off.

Figure 1 of the Song Dynasty shows a shaft center part 2 that can be rotated and has a flange 3.
The beam 1 is shown supporting a . A fixed annular lifting part 4 is provided in coaxial relation with the central axis to support fixed discs 5, 6, 7 and 8, each having teeth 9 and a central hole lO, each of which will be described in more detail below.
is provided. Each center hole 10 is dimensioned to fit into the flange 3''. The lifting portion 4 is provided with a hole 11, and a screw 12 is screwed into the hole, and the fixing disk 5 is inserted through the hole 13.
゜6.Tighten screws 7 and 8.

Adjacent discs 5, 6, 7 and 8 can be connected by screwable plates 14.

The flange 3 is also provided with a screw hole 15, and the screw 16 allows
The disk 17 supporting the knife member 18 is fixed. Spiral spring 19 forces knife member 18 against tooth 9 with a desired pressure.
serves the purpose of pressing against the disks 5, 6, 7.8. By means of the screw 16 the spring pressure of the spring 19 can be adjusted.

A resilient scraping member 35 is provided below the disk 17 to scrape off dirt and other deposits on the fixed plate 5.

These scraping members 35 extend up to the teeth 9.

Debris or other deposits, such as sand, can be removed from the knife member 1.
8 and fixing plates 5, 6, 7. , and 8, it will be clear that the knife member on the other side will be the center of the hinge movement and the associated knife member will perform the hinge movement.

This point is clearly illustrated in Figure 2. This figure schematically shows a drive device 20 with a frame shown in broken lines.

Furthermore, it is clear from FIG. 2 that the discs 5, 6, 7.8 are arranged somewhat together at an angle to the front, and that the beam l has a base surface that is raised somewhat forward.

FIG. 3 shows a leaflet 21 with a cut 22 provided by the apparatus of FIGS. 1 and 2. FIG. From this figure it can be seen that the upper edge of the lower part of the leaflet is sharply cut but not mechanically damaged.

FIG. 4 shows a beam 2 with a drum 24 fixed thereto.
3 is shown. A drive shaft 25 supports a rotary drive disk 26 having teeth 27 . Via the fixed shaft 28, a truncated-conical disc 30 with a periphery having teeth 29 connects the beam 2.
It is fixed under 3. The fixed tooth 29 cooperates with a knife member 37 which can be driven in rotation.

As shown in FIG. 5, each fixed plate 34 has teeth 29,
A truncated conical peripheral portion 36 is provided. Each member 37 of the knife 11 passes through a hole 39 in the disk 36, is supported by a biasing elastic piece 38 fixed to the lower surface thereof, and is elastically pressed against the tooth 29.

If dirt or other deposits are interposed between the frustoconical periphery 36 and the knife member 37, the knife member will hinge about the hinge line at the location of the hole 39. It should be noted that

The transmission mechanism 31 shown schematically by a broken line is driven by a driving means (not shown). As shown by arrows 32 and 33, respectively, adjacent discs 26 rotate in opposite rotational directions and with a phase difference such that the knife members do not contact each other in areas where each knife member partially overlaps. are doing.

It is clear from FIG. 1 that discs 5, 6, 7 and 8 are interchangeable. In this connection, discs 5 and 8 and 6
It should be noted that although 7 and 7 are identical, they are located at different locations in the array format. From this fact, it is clear that the four disks can assume four different positions by rotating and changing their positions.

To this end, the tooth 9 has a cutting edge not only on its lower surface but also on its upper surface. It can be used in four different ways (",
There are clear advantages in terms of the overall life of the device. Also, as a result of the self-sharpening effect, the period during which the knife member 18 remains sufficiently sharp is also significantly longer.

FIG. 6 shows an alternative embodiment, in which the knife members 37 are each supported by curved biasing elastic pieces 40 and fixed to the -1-plane of the disk 26. In this configuration, the knife member 37 can be replaced more easily than in the embodiment of FIG. 5. On the other hand, in the variant of FIG. There is even greater risk of picking up and accumulating other deposits.

In this alternative embodiment, the knife member 37 is connected to the disk 2
A hinge movement is possible about a hinge line extending in the area of the fixing point of the curved piece 40 on 6.

The disc is made of abrasion-resistant resin, such as reinforced synthetic resin.
In such embodiments, it may be desirable for the tooth edges to extend in a direction perpendicular to the main portion of the associated disc.

As a result of this configuration, there is relatively little wear on the blade.

Therefore, the present invention achieves the intended object by having the configuration as described in detail in the above embodiments.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective exploded view showing the details of the mowing device according to the present invention, Fig. 2 is a sectional view taken along the line - H in Fig. FIG. 4 is an enlarged sectional view of a leaf cut by the device, and FIG. 4 is a view corresponding to FIG. 1 of the alternative embodiment, and FIG. 5 is a sectional view taken along the line ■-■ in FIG. , FIG. 6 is a sectional view corresponding to FIG. 5 of an alternative embodiment. l...beam, 2...rotation drive shaft, 3...flange,
5.6,7. Death: fixed disc, 9 teeth, 10 central hole,
15 Screw hole, 17・Fixed disk, 18... Knife member, 19 Spiral spring, 23・Beam, 24・Drum, 25・Drive shaft, 26... Rotation drive disk, 27
- Teeth, 28... Fixed shaft, 29... Teeth, 36... Disc, 37... Knife member, 38... Biasing elastic piece, 40 One side.

Claims (1)

[Scope of Claims] 1) A large number of blades arranged in a row on one surface extending in a direction transverse to the direction of movement of the mowing device, each having a blade portion at least at the most extreme edge in the direction of movement. at least two fixed plates having teeth, each tooth having a free end formed in the shape of an arc, and extending in the direction of the arc;
affixed to each stationary plate to hold at least one knife member provided with a blade portion capable of cuttably cooperating with the blade portion of the associated stationary plate, the knife member being rotatably driveable about the center of said circular arc; A mowing device comprising a carrier member and a pressure means for pressing a particular or each knife member and an associated fixing plate against each other at a predetermined pressure, the mowing device comprising a group of up to three knife members on each carrier member. What is claimed is: 1. A mowing device characterized in that each knife member is mounted for hinge line movement about a hinge line extending substantially in the plane of the blade portion. 2) The mowing device according to claim 1, wherein the hinge line is separated from the free end of the knife member by a distance corresponding to at least twice the length of the blade portion of the knife member. A mowing device characterized in that the mowing device is positioned so that 3) The mowing device according to claim 2, characterized in that the hinge line viewed from the knife member side is located on the opposite side of the center of the carrier member. 4) The mowing device according to claim 3, characterized in that the hinge line of one knife member is determined by another knife member in the group or two other knife members. Grass mowing equipment. 5) A grass cutting device according to any one of claims 1 to 4, characterized in that the pressure means is adjustable. 6) The mowing device according to any one of claims 1 to 5, in which the blade portion and teeth of the knife member that cooperate with each other always move outward while the carrier member is being rotated. A mowing device characterized by having the following configuration. 7) The mowing device according to any one of claims 1 to 6, wherein the paths of adjacent knife members are
The knife members overlap partially and to a substantial extent, the knife members rotate at the same number of revolutions per minute, and exhibit a phase difference such that they do not come into contact with each other even at the overlapped portions. Grass mowing equipment. 8) The mowing device according to any one of claims 1 to 7, wherein the blade portion of the tooth extends substantially perpendicularly to the main plate of the associated fixed plate. A grass cutting device that is characterized by: 9) The mowing device according to claim 8, characterized in that the fixed plate is made of synthetic resin. 10) A mowing device according to any one of claims 1 to 9, in which each carrier member is arranged on the side facing its associated fixing plate to remove dirt and other deposits from the fixing plate. A mowing device characterized in that it is formed of a disc member provided with an elastic scrape member for scraping, and the scrape member extends to the blade portion of the tooth of the fixed plate.